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<br />j <br />1 <br />I <br />\ <br />I <br />! <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />of Juniper Mountain. The temporary structure located upstream of Craig, Colorado consisted of a <br />gravel dike extending from the right shore out into the channel approximately 80 to 100 meters. The <br />dike was approximately 2 to 3 m in height and was constructed by bulldozing river sediments from <br />downstream of the structure. The dike forced water into a small side channel just upstream of the <br />structure on river left. Water was diverted from this side channel though a headgate into an <br />irrigation ditch. The lower end of the side channel was dammed with rip-rap to prevent flow through <br />back to the river channel. This structure was visited three times during the course of the study. <br />During the first visit in August 4, 1992 (Trip 3), the dike was washed out from was was assumed to <br />be the previous years runoff. Only about 10 to 15 m of the dike was intact on the right side of the <br />river. Between Trip 3 and Trip 4 the dike was reconstructed. It is speculated that the dike is <br />constructed during low flows each year to provide water to the headgate. During visits to the <br />structure on both Trip 4 and 5, flow through the dike was provided by a 5 to 10 meter opening <br />against the left bank. Although a debris jam at the opening prevented boating through the dike, fish <br />passage would not have been impeded by the structure. <br /> <br />The structure at the head of Juniper Canyon was built in 1899 to provide water to the Maybell <br />irrigation ditch. According the the State Engineer, the diversion structure requires a large amount <br />of maintainance and has been rebuilt several times after large runoff events in the Yampa River. <br />This structure was visited one time in October during Trip 5. Constructed of large boulders and <br />rubble, the structure runs from bank to bank and feeds headgates on river right. Height of the <br />structure was estimated at 3 to 5 meters. It appeared that fish passage would have been possible <br />during the site visit through one deep chute that meandered through the boulders. In the estimation <br />of BIO/WEST biologists visiting the site, this structure is much more significant than the City of <br />Craig's diversion control structure in terms of its potential as a barrier to fish movement. However, <br />it should be noted that migration of radio tagged Colorado squawfish have been documented in both <br />an ups team and downstream direction over the Maybell ditch diversion structure on several occasions <br />(Wick et al. 1983, Miller et al. 1983, Tyus et al. 1987). <br /> <br />27 <br />